            string s1 = "A string is more ";
            string s2 = "than the sum of its chars.";

            // Concatenate s1 and s2. This actually creates a new
            // string object and stores it in s1, releasing the
            // reference to the original object.
            s1 += s2;

            System.Console.WriteLine(s1);
            // Output: A string is more than the sum of its chars.